netdev - [PATCH net-next v4 8/9] bnxt_en: Allocate the max bp->irq

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Message-ID: <20240828183235.128948-9-michael.chan@broadcom.com>
Date: Wed, 28 Aug 2024 11:32:34 -0700
From: Michael Chan <michael.chan@...adcom.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	pavan.chebbi@...adcom.com,
	andrew.gospodarek@...adcom.com,
	horms@...nel.org,
	helgaas@...nel.org,
	przemyslaw.kitszel@...el.com,
	Hongguang Gao <hongguang.gao@...adcom.com>,
	Somnath Kotur <somnath.kotur@...adcom.com>
Subject: [PATCH net-next v4 8/9] bnxt_en: Allocate the max bp->irq_tbl size for dynamic msix allocation

If dynamic MSIX allocation is supported, additional MSIX can be
allocated at run-time without reinitializing the existing MSIX entries.
The first step to support this dynamic scheme is to allocate a large
enough bp->irq_tbl if dynamic allocation is supported.

Reviewed-by: Hongguang Gao <hongguang.gao@...adcom.com>
Reviewed-by: Somnath Kotur <somnath.kotur@...adcom.com>
Reviewed-by: Simon Horman <horms@...nel.org>
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
v3: Use sizeof(*bp->irq_tbl)
v2: Fix typo in changelog
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 03598f8e0e07..fa4115f6dafe 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -10722,7 +10722,7 @@ static int bnxt_get_num_msix(struct bnxt *bp)
 
 static int bnxt_init_int_mode(struct bnxt *bp)
 {
-	int i, total_vecs, max, rc = 0, min = 1, ulp_msix, tx_cp;
+	int i, total_vecs, max, rc = 0, min = 1, ulp_msix, tx_cp, tbl_size;
 
 	total_vecs = bnxt_get_num_msix(bp);
 	max = bnxt_get_max_func_irqs(bp);
@@ -10743,7 +10743,10 @@ static int bnxt_init_int_mode(struct bnxt *bp)
 		goto msix_setup_exit;
 	}
 
-	bp->irq_tbl = kcalloc(total_vecs, sizeof(struct bnxt_irq), GFP_KERNEL);
+	tbl_size = total_vecs;
+	if (pci_msix_can_alloc_dyn(bp->pdev))
+		tbl_size = max;
+	bp->irq_tbl = kcalloc(tbl_size, sizeof(*bp->irq_tbl), GFP_KERNEL);
 	if (bp->irq_tbl) {
 		for (i = 0; i < total_vecs; i++)
 			bp->irq_tbl[i].vector = pci_irq_vector(bp->pdev, i);
-- 
2.30.1